A traveling bookseller acquainted with Bonnard. He appears at a critical moment when Bonnard is preparing to sell his collection to save Jeanne. Coccoz reveals the truth that Mouche had stolen the rare book and forged Jeanne's custody papers, which exposes Mouche's crimes, reverses the conflict, and ultimately allows Bonnard to adopt Jeanne without paying.
No direct relationship exists; they remain parallel figures in the narrative.
Direct conflict where Coccoz exposes Mouche's criminal actions.
A casual social connection rooted in their shared book trade background.
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